drivers/thermal/thermal_sys.c

   1 /*
   2  *  thermal.c - Generic Thermal Management Sysfs support.
   3  *
   4  *  Copyright (C) 2008 Intel Corp
   5  *  Copyright (C) 2008 Zhang Rui <rui.zhang@intel.com>
   6  *  Copyright (C) 2008 Sujith Thomas <sujith.thomas@intel.com>
   7  *
   8  *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; version 2 of the License.
  13  *
  14  *  This program is distributed in the hope that it will be useful, but
  15  *  WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  *  General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License along
  20  *  with this program; if not, write to the Free Software Foundation, Inc.,
  21  *  59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  22  *
  23  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  24  */
  25
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27
  28 #include <linux/module.h>
  29 #include <linux/device.h>
  30 #include <linux/err.h>
  31 #include <linux/slab.h>
  32 #include <linux/kdev_t.h>
  33 #include <linux/idr.h>
  34 #include <linux/thermal.h>
  35 #include <linux/reboot.h>
  36 #include <net/netlink.h>
  37 #include <net/genetlink.h>
  38
  39 #include "thermal_core.h"
  40
  41 MODULE_AUTHOR("Zhang Rui");
  42 MODULE_DESCRIPTION("Generic thermal management sysfs support");
  43 MODULE_LICENSE("GPL");
  44
  45 static DEFINE_IDR(thermal_tz_idr);
  46 static DEFINE_IDR(thermal_cdev_idr);
  47 static DEFINE_MUTEX(thermal_idr_lock);
  48
  49 static LIST_HEAD(thermal_tz_list);
  50 static LIST_HEAD(thermal_cdev_list);
  51 static LIST_HEAD(thermal_governor_list);
  52
  53 static DEFINE_MUTEX(thermal_list_lock);
  54 static DEFINE_MUTEX(thermal_governor_lock);
  55
  56 static struct thermal_governor *__find_governor(const char *name)
  57 {
  58         struct thermal_governor *pos;
  59
  60         list_for_each_entry(pos, &thermal_governor_list, governor_list)
  61                 if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH))
  62                         return pos;
  63
  64         return NULL;
  65 }
  66
  67 int thermal_register_governor(struct thermal_governor *governor)
  68 {
  69         int err;
  70         const char *name;
  71         struct thermal_zone_device *pos;
  72
  73         if (!governor)
  74                 return -EINVAL;
  75
  76         mutex_lock(&thermal_governor_lock);
  77
  78         err = -EBUSY;
  79         if (__find_governor(governor->name) == NULL) {
  80                 err = 0;
  81                 list_add(&governor->governor_list, &thermal_governor_list);
  82         }
  83
  84         mutex_lock(&thermal_list_lock);
  85
  86         list_for_each_entry(pos, &thermal_tz_list, node) {
  87                 if (pos->governor)
  88                         continue;
  89                 if (pos->tzp)
  90                         name = pos->tzp->governor_name;
  91                 else
  92                         name = DEFAULT_THERMAL_GOVERNOR;
  93                 if (!strnicmp(name, governor->name, THERMAL_NAME_LENGTH))
  94                         pos->governor = governor;
  95         }
  96
  97         mutex_unlock(&thermal_list_lock);
  98         mutex_unlock(&thermal_governor_lock);
  99
 100         return err;
 101 }
 102 EXPORT_SYMBOL_GPL(thermal_register_governor);
 103
 104 void thermal_unregister_governor(struct thermal_governor *governor)
 105 {
 106         struct thermal_zone_device *pos;
 107
 108         if (!governor)
 109                 return;
 110
 111         mutex_lock(&thermal_governor_lock);
 112
 113         if (__find_governor(governor->name) == NULL)
 114                 goto exit;
 115
 116         mutex_lock(&thermal_list_lock);
 117
 118         list_for_each_entry(pos, &thermal_tz_list, node) {
 119                 if (!strnicmp(pos->governor->name, governor->name,
 120                                                 THERMAL_NAME_LENGTH))
 121                         pos->governor = NULL;
 122         }
 123
 124         mutex_unlock(&thermal_list_lock);
 125         list_del(&governor->governor_list);
 126 exit:
 127         mutex_unlock(&thermal_governor_lock);
 128         return;
 129 }
 130 EXPORT_SYMBOL_GPL(thermal_unregister_governor);
 131
 132 static int get_idr(struct idr *idr, struct mutex *lock, int *id)
 133 {
 134         int err;
 135
 136 again:
 137         if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
 138                 return -ENOMEM;
 139
 140         if (lock)
 141                 mutex_lock(lock);
 142         err = idr_get_new(idr, NULL, id);
 143         if (lock)
 144                 mutex_unlock(lock);
 145         if (unlikely(err == -EAGAIN))
 146                 goto again;
 147         else if (unlikely(err))
 148                 return err;
 149
 150         *id = *id & MAX_IDR_MASK;
 151         return 0;
 152 }
 153
 154 static void release_idr(struct idr *idr, struct mutex *lock, int id)
 155 {
 156         if (lock)
 157                 mutex_lock(lock);
 158         idr_remove(idr, id);
 159         if (lock)
 160                 mutex_unlock(lock);
 161 }
 162
 163 int get_tz_trend(struct thermal_zone_device *tz, int trip)
 164 {
 165         enum thermal_trend trend;
 166
 167         if (!tz->ops->get_trend || tz->ops->get_trend(tz, trip, &trend)) {
 168                 if (tz->temperature > tz->last_temperature)
 169                         trend = THERMAL_TREND_RAISING;
 170                 else if (tz->temperature < tz->last_temperature)
 171                         trend = THERMAL_TREND_DROPPING;
 172                 else
 173                         trend = THERMAL_TREND_STABLE;
 174         }
 175
 176         return trend;
 177 }
 178 EXPORT_SYMBOL(get_tz_trend);
 179
 180 struct thermal_instance *get_thermal_instance(struct thermal_zone_device *tz,
 181                         struct thermal_cooling_device *cdev, int trip)
 182 {
 183         struct thermal_instance *pos = NULL;
 184         struct thermal_instance *target_instance = NULL;
 185
 186         mutex_lock(&tz->lock);
 187         mutex_lock(&cdev->lock);
 188
 189         list_for_each_entry(pos, &tz->thermal_instances, tz_node) {
 190                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
 191                         target_instance = pos;
 192                         break;
 193                 }
 194         }
 195
 196         mutex_unlock(&cdev->lock);
 197         mutex_unlock(&tz->lock);
 198
 199         return target_instance;
 200 }
 201 EXPORT_SYMBOL(get_thermal_instance);
 202
 203 static void print_bind_err_msg(struct thermal_zone_device *tz,
 204                         struct thermal_cooling_device *cdev, int ret)
 205 {
 206         dev_err(&tz->device, "binding zone %s with cdev %s failed:%d\n",
 207                                 tz->type, cdev->type, ret);
 208 }
 209
 210 static void __bind(struct thermal_zone_device *tz, int mask,
 211                         struct thermal_cooling_device *cdev)
 212 {
 213         int i, ret;
 214
 215         for (i = 0; i < tz->trips; i++) {
 216                 if (mask & (1 << i)) {
 217                         ret = thermal_zone_bind_cooling_device(tz, i, cdev,
 218                                         THERMAL_NO_LIMIT, THERMAL_NO_LIMIT);
 219                         if (ret)
 220                                 print_bind_err_msg(tz, cdev, ret);
 221                 }
 222         }
 223 }
 224
 225 static void __unbind(struct thermal_zone_device *tz, int mask,
 226                         struct thermal_cooling_device *cdev)
 227 {
 228         int i;
 229
 230         for (i = 0; i < tz->trips; i++)
 231                 if (mask & (1 << i))
 232                         thermal_zone_unbind_cooling_device(tz, i, cdev);
 233 }
 234
 235 static void bind_cdev(struct thermal_cooling_device *cdev)
 236 {
 237         int i, ret;
 238         const struct thermal_zone_params *tzp;
 239         struct thermal_zone_device *pos = NULL;
 240
 241         mutex_lock(&thermal_list_lock);
 242
 243         list_for_each_entry(pos, &thermal_tz_list, node) {
 244                 if (!pos->tzp && !pos->ops->bind)
 245                         continue;
 246
 247                 if (!pos->tzp && pos->ops->bind) {
 248                         ret = pos->ops->bind(pos, cdev);
 249                         if (ret)
 250                                 print_bind_err_msg(pos, cdev, ret);
 251                 }
 252
 253                 tzp = pos->tzp;
 254                 if (!tzp || !tzp->tbp)
 255                         continue;
 256
 257                 for (i = 0; i < tzp->num_tbps; i++) {
 258                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 259                                 continue;
 260                         if (tzp->tbp[i].match(pos, cdev))
 261                                 continue;
 262                         tzp->tbp[i].cdev = cdev;
 263                         __bind(pos, tzp->tbp[i].trip_mask, cdev);
 264                 }
 265         }
 266
 267         mutex_unlock(&thermal_list_lock);
 268 }
 269
 270 static void bind_tz(struct thermal_zone_device *tz)
 271 {
 272         int i, ret;
 273         struct thermal_cooling_device *pos = NULL;
 274         const struct thermal_zone_params *tzp = tz->tzp;
 275
 276         if (!tzp && !tz->ops->bind)
 277                 return;
 278
 279         mutex_lock(&thermal_list_lock);
 280
 281         /* If there is no platform data, try to use ops->bind */
 282         if (!tzp && tz->ops->bind) {
 283                 list_for_each_entry(pos, &thermal_cdev_list, node) {
 284                         ret = tz->ops->bind(tz, pos);
 285                         if (ret)
 286                                 print_bind_err_msg(tz, pos, ret);
 287                 }
 288                 goto exit;
 289         }
 290
 291         if (!tzp || !tzp->tbp)
 292                 goto exit;
 293
 294         list_for_each_entry(pos, &thermal_cdev_list, node) {
 295                 for (i = 0; i < tzp->num_tbps; i++) {
 296                         if (tzp->tbp[i].cdev || !tzp->tbp[i].match)
 297                                 continue;
 298                         if (tzp->tbp[i].match(tz, pos))
 299                                 continue;
 300                         tzp->tbp[i].cdev = pos;
 301                         __bind(tz, tzp->tbp[i].trip_mask, pos);
 302                 }
 303         }
 304 exit:
 305         mutex_unlock(&thermal_list_lock);
 306 }
 307
 308 static void thermal_zone_device_set_polling(struct thermal_zone_device *tz,
 309                                             int delay)
 310 {
 311         if (delay > 1000)
 312                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 313                                  round_jiffies(msecs_to_jiffies(delay)));
 314         else if (delay)
 315                 mod_delayed_work(system_freezable_wq, &tz->poll_queue,
 316                                  msecs_to_jiffies(delay));
 317         else
 318                 cancel_delayed_work(&tz->poll_queue);
 319 }
 320
 321 static void monitor_thermal_zone(struct thermal_zone_device *tz)
 322 {
 323         mutex_lock(&tz->lock);
 324
 325         if (tz->passive)
 326                 thermal_zone_device_set_polling(tz, tz->passive_delay);
 327         else if (tz->polling_delay)
 328                 thermal_zone_device_set_polling(tz, tz->polling_delay);
 329         else
 330                 thermal_zone_device_set_polling(tz, 0);
 331
 332         mutex_unlock(&tz->lock);
 333 }
 334
 335 static void handle_non_critical_trips(struct thermal_zone_device *tz,
 336                         int trip, enum thermal_trip_type trip_type)
 337 {
 338         if (tz->governor)
 339                 tz->governor->throttle(tz, trip);
 340 }
 341
 342 static void handle_critical_trips(struct thermal_zone_device *tz,
 343                                 int trip, enum thermal_trip_type trip_type)
 344 {
 345         long trip_temp;
 346
 347         tz->ops->get_trip_temp(tz, trip, &trip_temp);
 348
 349         /* If we have not crossed the trip_temp, we do not care. */
 350         if (tz->temperature < trip_temp)
 351                 return;
 352
 353         if (tz->ops->notify)
 354                 tz->ops->notify(tz, trip, trip_type);
 355
 356         if (trip_type == THERMAL_TRIP_CRITICAL) {
 357                 dev_emerg(&tz->device,
 358                           "critical temperature reached(%d C),shutting down\n",
 359                           tz->temperature / 1000);
 360                 orderly_poweroff(true);
 361         }
 362 }
 363
 364 static void handle_thermal_trip(struct thermal_zone_device *tz, int trip)
 365 {
 366         enum thermal_trip_type type;
 367
 368         tz->ops->get_trip_type(tz, trip, &type);
 369
 370         if (type == THERMAL_TRIP_CRITICAL || type == THERMAL_TRIP_HOT)
 371                 handle_critical_trips(tz, trip, type);
 372         else
 373                 handle_non_critical_trips(tz, trip, type);
 374         /*
 375          * Alright, we handled this trip successfully.
 376          * So, start monitoring again.
 377          */
 378         monitor_thermal_zone(tz);
 379 }
 380
 381 static int thermal_zone_get_temp(struct thermal_zone_device *tz,
 382                                 unsigned long *temp)
 383 {
 384         int ret = 0;
 385 #ifdef CONFIG_THERMAL_EMULATION
 386         int count;
 387         unsigned long crit_temp = -1UL;
 388         enum thermal_trip_type type;
 389 #endif
 390
 391         mutex_lock(&tz->lock);
 392
 393         ret = tz->ops->get_temp(tz, temp);
 394 #ifdef CONFIG_THERMAL_EMULATION
 395         if (!tz->emul_temperature)
 396                 goto skip_emul;
 397
 398         for (count = 0; count < tz->trips; count++) {
 399                 ret = tz->ops->get_trip_type(tz, count, &type);
 400                 if (!ret && type == THERMAL_TRIP_CRITICAL) {
 401                         ret = tz->ops->get_trip_temp(tz, count, &crit_temp);
 402                         break;
 403                 }
 404         }
 405
 406         if (ret)
 407                 goto skip_emul;
 408
 409         if (*temp < crit_temp)
 410                 *temp = tz->emul_temperature;
 411 skip_emul:
 412 #endif
 413         mutex_unlock(&tz->lock);
 414         return ret;
 415 }
 416
 417 static void update_temperature(struct thermal_zone_device *tz)
 418 {
 419         long temp;
 420         int ret;
 421
 422         ret = thermal_zone_get_temp(tz, &temp);
 423         if (ret) {
 424                 dev_warn(&tz->device, "failed to read out thermal zone %d\n",
 425                          tz->id);
 426                 return;
 427         }
 428
 429         mutex_lock(&tz->lock);
 430         tz->last_temperature = tz->temperature;
 431         tz->temperature = temp;
 432         mutex_unlock(&tz->lock);
 433 }
 434
 435 void thermal_zone_device_update(struct thermal_zone_device *tz)
 436 {
 437         int count;
 438
 439         update_temperature(tz);
 440
 441         for (count = 0; count < tz->trips; count++)
 442                 handle_thermal_trip(tz, count);
 443 }
 444 EXPORT_SYMBOL(thermal_zone_device_update);
 445
 446 static void thermal_zone_device_check(struct work_struct *work)
 447 {
 448         struct thermal_zone_device *tz = container_of(work, struct
 449                                                       thermal_zone_device,
 450                                                       poll_queue.work);
 451         thermal_zone_device_update(tz);
 452 }
 453
 454 /* sys I/F for thermal zone */
 455
 456 #define to_thermal_zone(_dev) \
 457         container_of(_dev, struct thermal_zone_device, device)
 458
 459 static ssize_t
 460 type_show(struct device *dev, struct device_attribute *attr, char *buf)
 461 {
 462         struct thermal_zone_device *tz = to_thermal_zone(dev);
 463
 464         return sprintf(buf, "%s\n", tz->type);
 465 }
 466
 467 static ssize_t
 468 temp_show(struct device *dev, struct device_attribute *attr, char *buf)
 469 {
 470         struct thermal_zone_device *tz = to_thermal_zone(dev);
 471         long temperature;
 472         int ret;
 473
 474         ret = thermal_zone_get_temp(tz, &temperature);
 475
 476         if (ret)
 477                 return ret;
 478
 479         return sprintf(buf, "%ld\n", temperature);
 480 }
 481
 482 static ssize_t
 483 mode_show(struct device *dev, struct device_attribute *attr, char *buf)
 484 {
 485         struct thermal_zone_device *tz = to_thermal_zone(dev);
 486         enum thermal_device_mode mode;
 487         int result;
 488
 489         if (!tz->ops->get_mode)
 490                 return -EPERM;
 491
 492         result = tz->ops->get_mode(tz, &mode);
 493         if (result)
 494                 return result;
 495
 496         return sprintf(buf, "%s\n", mode == THERMAL_DEVICE_ENABLED ? "enabled"
 497                        : "disabled");
 498 }
 499
 500 static ssize_t
 501 mode_store(struct device *dev, struct device_attribute *attr,
 502            const char *buf, size_t count)
 503 {
 504         struct thermal_zone_device *tz = to_thermal_zone(dev);
 505         int result;
 506
 507         if (!tz->ops->set_mode)
 508                 return -EPERM;
 509
 510         if (!strncmp(buf, "enabled", sizeof("enabled") - 1))
 511                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_ENABLED);
 512         else if (!strncmp(buf, "disabled", sizeof("disabled") - 1))
 513                 result = tz->ops->set_mode(tz, THERMAL_DEVICE_DISABLED);
 514         else
 515                 result = -EINVAL;
 516
 517         if (result)
 518                 return result;
 519
 520         return count;
 521 }
 522
 523 static ssize_t
 524 trip_point_type_show(struct device *dev, struct device_attribute *attr,
 525                      char *buf)
 526 {
 527         struct thermal_zone_device *tz = to_thermal_zone(dev);
 528         enum thermal_trip_type type;
 529         int trip, result;
 530
 531         if (!tz->ops->get_trip_type)
 532                 return -EPERM;
 533
 534         if (!sscanf(attr->attr.name, "trip_point_%d_type", &trip))
 535                 return -EINVAL;
 536
 537         result = tz->ops->get_trip_type(tz, trip, &type);
 538         if (result)
 539                 return result;
 540
 541         switch (type) {
 542         case THERMAL_TRIP_CRITICAL:
 543                 return sprintf(buf, "critical\n");
 544         case THERMAL_TRIP_HOT:
 545                 return sprintf(buf, "hot\n");
 546         case THERMAL_TRIP_PASSIVE:
 547                 return sprintf(buf, "passive\n");
 548         case THERMAL_TRIP_ACTIVE:
 549                 return sprintf(buf, "active\n");
 550         default:
 551                 return sprintf(buf, "unknown\n");
 552         }
 553 }
 554
 555 static ssize_t
 556 trip_point_temp_store(struct device *dev, struct device_attribute *attr,
 557                      const char *buf, size_t count)
 558 {
 559         struct thermal_zone_device *tz = to_thermal_zone(dev);
 560         int trip, ret;
 561         unsigned long temperature;
 562
 563         if (!tz->ops->set_trip_temp)
 564                 return -EPERM;
 565
 566         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 567                 return -EINVAL;
 568
 569         if (kstrtoul(buf, 10, &temperature))
 570                 return -EINVAL;
 571
 572         ret = tz->ops->set_trip_temp(tz, trip, temperature);
 573
 574         return ret ? ret : count;
 575 }
 576
 577 static ssize_t
 578 trip_point_temp_show(struct device *dev, struct device_attribute *attr,
 579                      char *buf)
 580 {
 581         struct thermal_zone_device *tz = to_thermal_zone(dev);
 582         int trip, ret;
 583         long temperature;
 584
 585         if (!tz->ops->get_trip_temp)
 586                 return -EPERM;
 587
 588         if (!sscanf(attr->attr.name, "trip_point_%d_temp", &trip))
 589                 return -EINVAL;
 590
 591         ret = tz->ops->get_trip_temp(tz, trip, &temperature);
 592
 593         if (ret)
 594                 return ret;
 595
 596         return sprintf(buf, "%ld\n", temperature);
 597 }
 598
 599 static ssize_t
 600 trip_point_hyst_store(struct device *dev, struct device_attribute *attr,
 601                         const char *buf, size_t count)
 602 {
 603         struct thermal_zone_device *tz = to_thermal_zone(dev);
 604         int trip, ret;
 605         unsigned long temperature;
 606
 607         if (!tz->ops->set_trip_hyst)
 608                 return -EPERM;
 609
 610         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 611                 return -EINVAL;
 612
 613         if (kstrtoul(buf, 10, &temperature))
 614                 return -EINVAL;
 615
 616         /*
 617          * We are not doing any check on the 'temperature' value
 618          * here. The driver implementing 'set_trip_hyst' has to
 619          * take care of this.
 620          */
 621         ret = tz->ops->set_trip_hyst(tz, trip, temperature);
 622
 623         return ret ? ret : count;
 624 }
 625
 626 static ssize_t
 627 trip_point_hyst_show(struct device *dev, struct device_attribute *attr,
 628                         char *buf)
 629 {
 630         struct thermal_zone_device *tz = to_thermal_zone(dev);
 631         int trip, ret;
 632         unsigned long temperature;
 633
 634         if (!tz->ops->get_trip_hyst)
 635                 return -EPERM;
 636
 637         if (!sscanf(attr->attr.name, "trip_point_%d_hyst", &trip))
 638                 return -EINVAL;
 639
 640         ret = tz->ops->get_trip_hyst(tz, trip, &temperature);
 641
 642         return ret ? ret : sprintf(buf, "%ld\n", temperature);
 643 }
 644
 645 static ssize_t
 646 passive_store(struct device *dev, struct device_attribute *attr,
 647                     const char *buf, size_t count)
 648 {
 649         struct thermal_zone_device *tz = to_thermal_zone(dev);
 650         struct thermal_cooling_device *cdev = NULL;
 651         int state;
 652
 653         if (!sscanf(buf, "%d\n", &state))
 654                 return -EINVAL;
 655
 656         /* sanity check: values below 1000 millicelcius don't make sense
 657          * and can cause the system to go into a thermal heart attack
 658          */
 659         if (state && state < 1000)
 660                 return -EINVAL;
 661
 662         if (state && !tz->forced_passive) {
 663                 mutex_lock(&thermal_list_lock);
 664                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 665                         if (!strncmp("Processor", cdev->type,
 666                                      sizeof("Processor")))
 667                                 thermal_zone_bind_cooling_device(tz,
 668                                                 THERMAL_TRIPS_NONE, cdev,
 669                                                 THERMAL_NO_LIMIT,
 670                                                 THERMAL_NO_LIMIT);
 671                 }
 672                 mutex_unlock(&thermal_list_lock);
 673                 if (!tz->passive_delay)
 674                         tz->passive_delay = 1000;
 675         } else if (!state && tz->forced_passive) {
 676                 mutex_lock(&thermal_list_lock);
 677                 list_for_each_entry(cdev, &thermal_cdev_list, node) {
 678                         if (!strncmp("Processor", cdev->type,
 679                                      sizeof("Processor")))
 680                                 thermal_zone_unbind_cooling_device(tz,
 681                                                                    THERMAL_TRIPS_NONE,
 682                                                                    cdev);
 683                 }
 684                 mutex_unlock(&thermal_list_lock);
 685                 tz->passive_delay = 0;
 686         }
 687
 688         tz->forced_passive = state;
 689
 690         thermal_zone_device_update(tz);
 691
 692         return count;
 693 }
 694
 695 static ssize_t
 696 passive_show(struct device *dev, struct device_attribute *attr,
 697                    char *buf)
 698 {
 699         struct thermal_zone_device *tz = to_thermal_zone(dev);
 700
 701         return sprintf(buf, "%d\n", tz->forced_passive);
 702 }
 703
 704 static ssize_t
 705 policy_store(struct device *dev, struct device_attribute *attr,
 706                     const char *buf, size_t count)
 707 {
 708         int ret = -EINVAL;
 709         struct thermal_zone_device *tz = to_thermal_zone(dev);
 710         struct thermal_governor *gov;
 711
 712         mutex_lock(&thermal_governor_lock);
 713
 714         gov = __find_governor(buf);
 715         if (!gov)
 716                 goto exit;
 717
 718         tz->governor = gov;
 719         ret = count;
 720
 721 exit:
 722         mutex_unlock(&thermal_governor_lock);
 723         return ret;
 724 }
 725
 726 static ssize_t
 727 policy_show(struct device *dev, struct device_attribute *devattr, char *buf)
 728 {
 729         struct thermal_zone_device *tz = to_thermal_zone(dev);
 730
 731         return sprintf(buf, "%s\n", tz->governor->name);
 732 }
 733
 734 #ifdef CONFIG_THERMAL_EMULATION
 735 static ssize_t
 736 emul_temp_store(struct device *dev, struct device_attribute *attr,
 737                      const char *buf, size_t count)
 738 {
 739         struct thermal_zone_device *tz = to_thermal_zone(dev);
 740         int ret = 0;
 741         unsigned long temperature;
 742
 743         if (kstrtoul(buf, 10, &temperature))
 744                 return -EINVAL;
 745
 746         if (!tz->ops->set_emul_temp) {
 747                 mutex_lock(&tz->lock);
 748                 tz->emul_temperature = temperature;
 749                 mutex_unlock(&tz->lock);
 750         } else {
 751                 ret = tz->ops->set_emul_temp(tz, temperature);
 752         }
 753
 754         return ret ? ret : count;
 755 }
 756 static DEVICE_ATTR(emul_temp, S_IWUSR, NULL, emul_temp_store);
 757 #endif/*CONFIG_THERMAL_EMULATION*/
 758
 759 static DEVICE_ATTR(type, 0444, type_show, NULL);
 760 static DEVICE_ATTR(temp, 0444, temp_show, NULL);
 761 static DEVICE_ATTR(mode, 0644, mode_show, mode_store);
 762 static DEVICE_ATTR(passive, S_IRUGO | S_IWUSR, passive_show, passive_store);
 763 static DEVICE_ATTR(policy, S_IRUGO | S_IWUSR, policy_show, policy_store);
 764
 765 /* sys I/F for cooling device */
 766 #define to_cooling_device(_dev) \
 767         container_of(_dev, struct thermal_cooling_device, device)
 768
 769 static ssize_t
 770 thermal_cooling_device_type_show(struct device *dev,
 771                                  struct device_attribute *attr, char *buf)
 772 {
 773         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 774
 775         return sprintf(buf, "%s\n", cdev->type);
 776 }
 777
 778 static ssize_t
 779 thermal_cooling_device_max_state_show(struct device *dev,
 780                                       struct device_attribute *attr, char *buf)
 781 {
 782         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 783         unsigned long state;
 784         int ret;
 785
 786         ret = cdev->ops->get_max_state(cdev, &state);
 787         if (ret)
 788                 return ret;
 789         return sprintf(buf, "%ld\n", state);
 790 }
 791
 792 static ssize_t
 793 thermal_cooling_device_cur_state_show(struct device *dev,
 794                                       struct device_attribute *attr, char *buf)
 795 {
 796         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 797         unsigned long state;
 798         int ret;
 799
 800         ret = cdev->ops->get_cur_state(cdev, &state);
 801         if (ret)
 802                 return ret;
 803         return sprintf(buf, "%ld\n", state);
 804 }
 805
 806 static ssize_t
 807 thermal_cooling_device_cur_state_store(struct device *dev,
 808                                        struct device_attribute *attr,
 809                                        const char *buf, size_t count)
 810 {
 811         struct thermal_cooling_device *cdev = to_cooling_device(dev);
 812         unsigned long state;
 813         int result;
 814
 815         if (!sscanf(buf, "%ld\n", &state))
 816                 return -EINVAL;
 817
 818         if ((long)state < 0)
 819                 return -EINVAL;
 820
 821         result = cdev->ops->set_cur_state(cdev, state);
 822         if (result)
 823                 return result;
 824         return count;
 825 }
 826
 827 static struct device_attribute dev_attr_cdev_type =
 828 __ATTR(type, 0444, thermal_cooling_device_type_show, NULL);
 829 static DEVICE_ATTR(max_state, 0444,
 830                    thermal_cooling_device_max_state_show, NULL);
 831 static DEVICE_ATTR(cur_state, 0644,
 832                    thermal_cooling_device_cur_state_show,
 833                    thermal_cooling_device_cur_state_store);
 834
 835 static ssize_t
 836 thermal_cooling_device_trip_point_show(struct device *dev,
 837                                        struct device_attribute *attr, char *buf)
 838 {
 839         struct thermal_instance *instance;
 840
 841         instance =
 842             container_of(attr, struct thermal_instance, attr);
 843
 844         if (instance->trip == THERMAL_TRIPS_NONE)
 845                 return sprintf(buf, "-1\n");
 846         else
 847                 return sprintf(buf, "%d\n", instance->trip);
 848 }
 849
 850 /* Device management */
 851
 852 #if defined(CONFIG_THERMAL_HWMON)
 853
 854 /* hwmon sys I/F */
 855 #include <linux/hwmon.h>
 856
 857 /* thermal zone devices with the same type share one hwmon device */
 858 struct thermal_hwmon_device {
 859         char type[THERMAL_NAME_LENGTH];
 860         struct device *device;
 861         int count;
 862         struct list_head tz_list;
 863         struct list_head node;
 864 };
 865
 866 struct thermal_hwmon_attr {
 867         struct device_attribute attr;
 868         char name[16];
 869 };
 870
 871 /* one temperature input for each thermal zone */
 872 struct thermal_hwmon_temp {
 873         struct list_head hwmon_node;
 874         struct thermal_zone_device *tz;
 875         struct thermal_hwmon_attr temp_input;   /* hwmon sys attr */
 876         struct thermal_hwmon_attr temp_crit;    /* hwmon sys attr */
 877 };
 878
 879 static LIST_HEAD(thermal_hwmon_list);
 880
 881 static ssize_t
 882 name_show(struct device *dev, struct device_attribute *attr, char *buf)
 883 {
 884         struct thermal_hwmon_device *hwmon = dev_get_drvdata(dev);
 885         return sprintf(buf, "%s\n", hwmon->type);
 886 }
 887 static DEVICE_ATTR(name, 0444, name_show, NULL);
 888
 889 static ssize_t
 890 temp_input_show(struct device *dev, struct device_attribute *attr, char *buf)
 891 {
 892         long temperature;
 893         int ret;
 894         struct thermal_hwmon_attr *hwmon_attr
 895                         = container_of(attr, struct thermal_hwmon_attr, attr);
 896         struct thermal_hwmon_temp *temp
 897                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 898                                        temp_input);
 899         struct thermal_zone_device *tz = temp->tz;
 900
 901         ret = thermal_zone_get_temp(tz, &temperature);
 902
 903         if (ret)
 904                 return ret;
 905
 906         return sprintf(buf, "%ld\n", temperature);
 907 }
 908
 909 static ssize_t
 910 temp_crit_show(struct device *dev, struct device_attribute *attr,
 911                 char *buf)
 912 {
 913         struct thermal_hwmon_attr *hwmon_attr
 914                         = container_of(attr, struct thermal_hwmon_attr, attr);
 915         struct thermal_hwmon_temp *temp
 916                         = container_of(hwmon_attr, struct thermal_hwmon_temp,
 917                                        temp_crit);
 918         struct thermal_zone_device *tz = temp->tz;
 919         long temperature;
 920         int ret;
 921
 922         ret = tz->ops->get_trip_temp(tz, 0, &temperature);
 923         if (ret)
 924                 return ret;
 925
 926         return sprintf(buf, "%ld\n", temperature);
 927 }
 928
 929
 930 static struct thermal_hwmon_device *
 931 thermal_hwmon_lookup_by_type(const struct thermal_zone_device *tz)
 932 {
 933         struct thermal_hwmon_device *hwmon;
 934
 935         mutex_lock(&thermal_list_lock);
 936         list_for_each_entry(hwmon, &thermal_hwmon_list, node)
 937                 if (!strcmp(hwmon->type, tz->type)) {
 938                         mutex_unlock(&thermal_list_lock);
 939                         return hwmon;
 940                 }
 941         mutex_unlock(&thermal_list_lock);
 942
 943         return NULL;
 944 }
 945
 946 /* Find the temperature input matching a given thermal zone */
 947 static struct thermal_hwmon_temp *
 948 thermal_hwmon_lookup_temp(const struct thermal_hwmon_device *hwmon,
 949                           const struct thermal_zone_device *tz)
 950 {
 951         struct thermal_hwmon_temp *temp;
 952
 953         mutex_lock(&thermal_list_lock);
 954         list_for_each_entry(temp, &hwmon->tz_list, hwmon_node)
 955                 if (temp->tz == tz) {
 956                         mutex_unlock(&thermal_list_lock);
 957                         return temp;
 958                 }
 959         mutex_unlock(&thermal_list_lock);
 960
 961         return NULL;
 962 }
 963
 964 static int
 965 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
 966 {
 967         struct thermal_hwmon_device *hwmon;
 968         struct thermal_hwmon_temp *temp;
 969         int new_hwmon_device = 1;
 970         int result;
 971
 972         hwmon = thermal_hwmon_lookup_by_type(tz);
 973         if (hwmon) {
 974                 new_hwmon_device = 0;
 975                 goto register_sys_interface;
 976         }
 977
 978         hwmon = kzalloc(sizeof(struct thermal_hwmon_device), GFP_KERNEL);
 979         if (!hwmon)
 980                 return -ENOMEM;
 981
 982         INIT_LIST_HEAD(&hwmon->tz_list);
 983         strlcpy(hwmon->type, tz->type, THERMAL_NAME_LENGTH);
 984         hwmon->device = hwmon_device_register(NULL);
 985         if (IS_ERR(hwmon->device)) {
 986                 result = PTR_ERR(hwmon->device);
 987                 goto free_mem;
 988         }
 989         dev_set_drvdata(hwmon->device, hwmon);
 990         result = device_create_file(hwmon->device, &dev_attr_name);
 991         if (result)
 992                 goto free_mem;
 993
 994  register_sys_interface:
 995         temp = kzalloc(sizeof(struct thermal_hwmon_temp), GFP_KERNEL);
 996         if (!temp) {
 997                 result = -ENOMEM;
 998                 goto unregister_name;
 999         }
1000
1001         temp->tz = tz;
1002         hwmon->count++;
1003
1004         snprintf(temp->temp_input.name, sizeof(temp->temp_input.name),
1005                  "temp%d_input", hwmon->count);
1006         temp->temp_input.attr.attr.name = temp->temp_input.name;
1007         temp->temp_input.attr.attr.mode = 0444;
1008         temp->temp_input.attr.show = temp_input_show;
1009         sysfs_attr_init(&temp->temp_input.attr.attr);
1010         result = device_create_file(hwmon->device, &temp->temp_input.attr);
1011         if (result)
1012                 goto free_temp_mem;
1013
1014         if (tz->ops->get_crit_temp) {
1015                 unsigned long temperature;
1016                 if (!tz->ops->get_crit_temp(tz, &temperature)) {
1017                         snprintf(temp->temp_crit.name,
1018                                  sizeof(temp->temp_crit.name),
1019                                 "temp%d_crit", hwmon->count);
1020                         temp->temp_crit.attr.attr.name = temp->temp_crit.name;
1021                         temp->temp_crit.attr.attr.mode = 0444;
1022                         temp->temp_crit.attr.show = temp_crit_show;
1023                         sysfs_attr_init(&temp->temp_crit.attr.attr);
1024                         result = device_create_file(hwmon->device,
1025                                                     &temp->temp_crit.attr);
1026                         if (result)
1027                                 goto unregister_input;
1028                 }
1029         }
1030
1031         mutex_lock(&thermal_list_lock);
1032         if (new_hwmon_device)
1033                 list_add_tail(&hwmon->node, &thermal_hwmon_list);
1034         list_add_tail(&temp->hwmon_node, &hwmon->tz_list);
1035         mutex_unlock(&thermal_list_lock);
1036
1037         return 0;
1038
1039  unregister_input:
1040         device_remove_file(hwmon->device, &temp->temp_input.attr);
1041  free_temp_mem:
1042         kfree(temp);
1043  unregister_name:
1044         if (new_hwmon_device) {
1045                 device_remove_file(hwmon->device, &dev_attr_name);
1046                 hwmon_device_unregister(hwmon->device);
1047         }
1048  free_mem:
1049         if (new_hwmon_device)
1050                 kfree(hwmon);
1051
1052         return result;
1053 }
1054
1055 static void
1056 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1057 {
1058         struct thermal_hwmon_device *hwmon;
1059         struct thermal_hwmon_temp *temp;
1060
1061         hwmon = thermal_hwmon_lookup_by_type(tz);
1062         if (unlikely(!hwmon)) {
1063                 /* Should never happen... */
1064                 dev_dbg(&tz->device, "hwmon device lookup failed!\n");
1065                 return;
1066         }
1067
1068         temp = thermal_hwmon_lookup_temp(hwmon, tz);
1069         if (unlikely(!temp)) {
1070                 /* Should never happen... */
1071                 dev_dbg(&tz->device, "temperature input lookup failed!\n");
1072                 return;
1073         }
1074
1075         device_remove_file(hwmon->device, &temp->temp_input.attr);
1076         if (tz->ops->get_crit_temp)
1077                 device_remove_file(hwmon->device, &temp->temp_crit.attr);
1078
1079         mutex_lock(&thermal_list_lock);
1080         list_del(&temp->hwmon_node);
1081         kfree(temp);
1082         if (!list_empty(&hwmon->tz_list)) {
1083                 mutex_unlock(&thermal_list_lock);
1084                 return;
1085         }
1086         list_del(&hwmon->node);
1087         mutex_unlock(&thermal_list_lock);
1088
1089         device_remove_file(hwmon->device, &dev_attr_name);
1090         hwmon_device_unregister(hwmon->device);
1091         kfree(hwmon);
1092 }
1093 #else
1094 static int
1095 thermal_add_hwmon_sysfs(struct thermal_zone_device *tz)
1096 {
1097         return 0;
1098 }
1099
1100 static void
1101 thermal_remove_hwmon_sysfs(struct thermal_zone_device *tz)
1102 {
1103 }
1104 #endif
1105
1106 /**
1107  * thermal_zone_bind_cooling_device - bind a cooling device to a thermal zone
1108  * @tz:         thermal zone device
1109  * @trip:       indicates which trip point the cooling devices is
1110  *              associated with in this thermal zone.
1111  * @cdev:       thermal cooling device
1112  *
1113  * This function is usually called in the thermal zone device .bind callback.
1114  */
1115 int thermal_zone_bind_cooling_device(struct thermal_zone_device *tz,
1116                                      int trip,
1117                                      struct thermal_cooling_device *cdev,
1118                                      unsigned long upper, unsigned long lower)
1119 {
1120         struct thermal_instance *dev;
1121         struct thermal_instance *pos;
1122         struct thermal_zone_device *pos1;
1123         struct thermal_cooling_device *pos2;
1124         unsigned long max_state;
1125         int result;
1126
1127         if (trip >= tz->trips || (trip < 0 && trip != THERMAL_TRIPS_NONE))
1128                 return -EINVAL;
1129
1130         list_for_each_entry(pos1, &thermal_tz_list, node) {
1131                 if (pos1 == tz)
1132                         break;
1133         }
1134         list_for_each_entry(pos2, &thermal_cdev_list, node) {
1135                 if (pos2 == cdev)
1136                         break;
1137         }
1138
1139         if (tz != pos1 || cdev != pos2)
1140                 return -EINVAL;
1141
1142         cdev->ops->get_max_state(cdev, &max_state);
1143
1144         /* lower default 0, upper default max_state */
1145         lower = lower == THERMAL_NO_LIMIT ? 0 : lower;
1146         upper = upper == THERMAL_NO_LIMIT ? max_state : upper;
1147
1148         if (lower > upper || upper > max_state)
1149                 return -EINVAL;
1150
1151         dev =
1152             kzalloc(sizeof(struct thermal_instance), GFP_KERNEL);
1153         if (!dev)
1154                 return -ENOMEM;
1155         dev->tz = tz;
1156         dev->cdev = cdev;
1157         dev->trip = trip;
1158         dev->upper = upper;
1159         dev->lower = lower;
1160         dev->target = THERMAL_NO_TARGET;
1161
1162         result = get_idr(&tz->idr, &tz->lock, &dev->id);
1163         if (result)
1164                 goto free_mem;
1165
1166         sprintf(dev->name, "cdev%d", dev->id);
1167         result =
1168             sysfs_create_link(&tz->device.kobj, &cdev->device.kobj, dev->name);
1169         if (result)
1170                 goto release_idr;
1171
1172         sprintf(dev->attr_name, "cdev%d_trip_point", dev->id);
1173         sysfs_attr_init(&dev->attr.attr);
1174         dev->attr.attr.name = dev->attr_name;
1175         dev->attr.attr.mode = 0444;
1176         dev->attr.show = thermal_cooling_device_trip_point_show;
1177         result = device_create_file(&tz->device, &dev->attr);
1178         if (result)
1179                 goto remove_symbol_link;
1180
1181         mutex_lock(&tz->lock);
1182         mutex_lock(&cdev->lock);
1183         list_for_each_entry(pos, &tz->thermal_instances, tz_node)
1184             if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1185                 result = -EEXIST;
1186                 break;
1187         }
1188         if (!result) {
1189                 list_add_tail(&dev->tz_node, &tz->thermal_instances);
1190                 list_add_tail(&dev->cdev_node, &cdev->thermal_instances);
1191         }
1192         mutex_unlock(&cdev->lock);
1193         mutex_unlock(&tz->lock);
1194
1195         if (!result)
1196                 return 0;
1197
1198         device_remove_file(&tz->device, &dev->attr);
1199 remove_symbol_link:
1200         sysfs_remove_link(&tz->device.kobj, dev->name);
1201 release_idr:
1202         release_idr(&tz->idr, &tz->lock, dev->id);
1203 free_mem:
1204         kfree(dev);
1205         return result;
1206 }
1207 EXPORT_SYMBOL(thermal_zone_bind_cooling_device);
1208
1209 /**
1210  * thermal_zone_unbind_cooling_device - unbind a cooling device from a thermal zone
1211  * @tz:         thermal zone device
1212  * @trip:       indicates which trip point the cooling devices is
1213  *              associated with in this thermal zone.
1214  * @cdev:       thermal cooling device
1215  *
1216  * This function is usually called in the thermal zone device .unbind callback.
1217  */
1218 int thermal_zone_unbind_cooling_device(struct thermal_zone_device *tz,
1219                                        int trip,
1220                                        struct thermal_cooling_device *cdev)
1221 {
1222         struct thermal_instance *pos, *next;
1223
1224         mutex_lock(&tz->lock);
1225         mutex_lock(&cdev->lock);
1226         list_for_each_entry_safe(pos, next, &tz->thermal_instances, tz_node) {
1227                 if (pos->tz == tz && pos->trip == trip && pos->cdev == cdev) {
1228                         list_del(&pos->tz_node);
1229                         list_del(&pos->cdev_node);
1230                         mutex_unlock(&cdev->lock);
1231                         mutex_unlock(&tz->lock);
1232                         goto unbind;
1233                 }
1234         }
1235         mutex_unlock(&cdev->lock);
1236         mutex_unlock(&tz->lock);
1237
1238         return -ENODEV;
1239
1240 unbind:
1241         device_remove_file(&tz->device, &pos->attr);
1242         sysfs_remove_link(&tz->device.kobj, pos->name);
1243         release_idr(&tz->idr, &tz->lock, pos->id);
1244         kfree(pos);
1245         return 0;
1246 }
1247 EXPORT_SYMBOL(thermal_zone_unbind_cooling_device);
1248
1249 static void thermal_release(struct device *dev)
1250 {
1251         struct thermal_zone_device *tz;
1252         struct thermal_cooling_device *cdev;
1253
1254         if (!strncmp(dev_name(dev), "thermal_zone",
1255                      sizeof("thermal_zone") - 1)) {
1256                 tz = to_thermal_zone(dev);
1257                 kfree(tz);
1258         } else {
1259                 cdev = to_cooling_device(dev);
1260                 kfree(cdev);
1261         }
1262 }
1263
1264 static struct class thermal_class = {
1265         .name = "thermal",
1266         .dev_release = thermal_release,
1267 };
1268
1269 /**
1270  * thermal_cooling_device_register - register a new thermal cooling device
1271  * @type:       the thermal cooling device type.
1272  * @devdata:    device private data.
1273  * @ops:                standard thermal cooling devices callbacks.
1274  */
1275 struct thermal_cooling_device *
1276 thermal_cooling_device_register(char *type, void *devdata,
1277                                 const struct thermal_cooling_device_ops *ops)
1278 {
1279         struct thermal_cooling_device *cdev;
1280         int result;
1281
1282         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1283                 return ERR_PTR(-EINVAL);
1284
1285         if (!ops || !ops->get_max_state || !ops->get_cur_state ||
1286             !ops->set_cur_state)
1287                 return ERR_PTR(-EINVAL);
1288
1289         cdev = kzalloc(sizeof(struct thermal_cooling_device), GFP_KERNEL);
1290         if (!cdev)
1291                 return ERR_PTR(-ENOMEM);
1292
1293         result = get_idr(&thermal_cdev_idr, &thermal_idr_lock, &cdev->id);
1294         if (result) {
1295                 kfree(cdev);
1296                 return ERR_PTR(result);
1297         }
1298
1299         strcpy(cdev->type, type ? : "");
1300         mutex_init(&cdev->lock);
1301         INIT_LIST_HEAD(&cdev->thermal_instances);
1302         cdev->ops = ops;
1303         cdev->updated = true;
1304         cdev->device.class = &thermal_class;
1305         cdev->devdata = devdata;
1306         dev_set_name(&cdev->device, "cooling_device%d", cdev->id);
1307         result = device_register(&cdev->device);
1308         if (result) {
1309                 release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1310                 kfree(cdev);
1311                 return ERR_PTR(result);
1312         }
1313
1314         /* sys I/F */
1315         if (type) {
1316                 result = device_create_file(&cdev->device, &dev_attr_cdev_type);
1317                 if (result)
1318                         goto unregister;
1319         }
1320
1321         result = device_create_file(&cdev->device, &dev_attr_max_state);
1322         if (result)
1323                 goto unregister;
1324
1325         result = device_create_file(&cdev->device, &dev_attr_cur_state);
1326         if (result)
1327                 goto unregister;
1328
1329         /* Add 'this' new cdev to the global cdev list */
1330         mutex_lock(&thermal_list_lock);
1331         list_add(&cdev->node, &thermal_cdev_list);
1332         mutex_unlock(&thermal_list_lock);
1333
1334         /* Update binding information for 'this' new cdev */
1335         bind_cdev(cdev);
1336
1337         return cdev;
1338
1339 unregister:
1340         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1341         device_unregister(&cdev->device);
1342         return ERR_PTR(result);
1343 }
1344 EXPORT_SYMBOL(thermal_cooling_device_register);
1345
1346 /**
1347  * thermal_cooling_device_unregister - removes the registered thermal cooling device
1348  * @cdev:       the thermal cooling device to remove.
1349  *
1350  * thermal_cooling_device_unregister() must be called when the device is no
1351  * longer needed.
1352  */
1353 void thermal_cooling_device_unregister(struct thermal_cooling_device *cdev)
1354 {
1355         int i;
1356         const struct thermal_zone_params *tzp;
1357         struct thermal_zone_device *tz;
1358         struct thermal_cooling_device *pos = NULL;
1359
1360         if (!cdev)
1361                 return;
1362
1363         mutex_lock(&thermal_list_lock);
1364         list_for_each_entry(pos, &thermal_cdev_list, node)
1365             if (pos == cdev)
1366                 break;
1367         if (pos != cdev) {
1368                 /* thermal cooling device not found */
1369                 mutex_unlock(&thermal_list_lock);
1370                 return;
1371         }
1372         list_del(&cdev->node);
1373
1374         /* Unbind all thermal zones associated with 'this' cdev */
1375         list_for_each_entry(tz, &thermal_tz_list, node) {
1376                 if (tz->ops->unbind) {
1377                         tz->ops->unbind(tz, cdev);
1378                         continue;
1379                 }
1380
1381                 if (!tz->tzp || !tz->tzp->tbp)
1382                         continue;
1383
1384                 tzp = tz->tzp;
1385                 for (i = 0; i < tzp->num_tbps; i++) {
1386                         if (tzp->tbp[i].cdev == cdev) {
1387                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1388                                 tzp->tbp[i].cdev = NULL;
1389                         }
1390                 }
1391         }
1392
1393         mutex_unlock(&thermal_list_lock);
1394
1395         if (cdev->type[0])
1396                 device_remove_file(&cdev->device, &dev_attr_cdev_type);
1397         device_remove_file(&cdev->device, &dev_attr_max_state);
1398         device_remove_file(&cdev->device, &dev_attr_cur_state);
1399
1400         release_idr(&thermal_cdev_idr, &thermal_idr_lock, cdev->id);
1401         device_unregister(&cdev->device);
1402         return;
1403 }
1404 EXPORT_SYMBOL(thermal_cooling_device_unregister);
1405
1406 void thermal_cdev_update(struct thermal_cooling_device *cdev)
1407 {
1408         struct thermal_instance *instance;
1409         unsigned long target = 0;
1410
1411         /* cooling device is updated*/
1412         if (cdev->updated)
1413                 return;
1414
1415         mutex_lock(&cdev->lock);
1416         /* Make sure cdev enters the deepest cooling state */
1417         list_for_each_entry(instance, &cdev->thermal_instances, cdev_node) {
1418                 if (instance->target == THERMAL_NO_TARGET)
1419                         continue;
1420                 if (instance->target > target)
1421                         target = instance->target;
1422         }
1423         mutex_unlock(&cdev->lock);
1424         cdev->ops->set_cur_state(cdev, target);
1425         cdev->updated = true;
1426 }
1427 EXPORT_SYMBOL(thermal_cdev_update);
1428
1429 /**
1430  * notify_thermal_framework - Sensor drivers use this API to notify framework
1431  * @tz:         thermal zone device
1432  * @trip:       indicates which trip point has been crossed
1433  *
1434  * This function handles the trip events from sensor drivers. It starts
1435  * throttling the cooling devices according to the policy configured.
1436  * For CRITICAL and HOT trip points, this notifies the respective drivers,
1437  * and does actual throttling for other trip points i.e ACTIVE and PASSIVE.
1438  * The throttling policy is based on the configured platform data; if no
1439  * platform data is provided, this uses the step_wise throttling policy.
1440  */
1441 void notify_thermal_framework(struct thermal_zone_device *tz, int trip)
1442 {
1443         handle_thermal_trip(tz, trip);
1444 }
1445 EXPORT_SYMBOL(notify_thermal_framework);
1446
1447 /**
1448  * create_trip_attrs - create attributes for trip points
1449  * @tz:         the thermal zone device
1450  * @mask:       Writeable trip point bitmap.
1451  */
1452 static int create_trip_attrs(struct thermal_zone_device *tz, int mask)
1453 {
1454         int indx;
1455         int size = sizeof(struct thermal_attr) * tz->trips;
1456
1457         tz->trip_type_attrs = kzalloc(size, GFP_KERNEL);
1458         if (!tz->trip_type_attrs)
1459                 return -ENOMEM;
1460
1461         tz->trip_temp_attrs = kzalloc(size, GFP_KERNEL);
1462         if (!tz->trip_temp_attrs) {
1463                 kfree(tz->trip_type_attrs);
1464                 return -ENOMEM;
1465         }
1466
1467         if (tz->ops->get_trip_hyst) {
1468                 tz->trip_hyst_attrs = kzalloc(size, GFP_KERNEL);
1469                 if (!tz->trip_hyst_attrs) {
1470                         kfree(tz->trip_type_attrs);
1471                         kfree(tz->trip_temp_attrs);
1472                         return -ENOMEM;
1473                 }
1474         }
1475
1476
1477         for (indx = 0; indx < tz->trips; indx++) {
1478                 /* create trip type attribute */
1479                 snprintf(tz->trip_type_attrs[indx].name, THERMAL_NAME_LENGTH,
1480                          "trip_point_%d_type", indx);
1481
1482                 sysfs_attr_init(&tz->trip_type_attrs[indx].attr.attr);
1483                 tz->trip_type_attrs[indx].attr.attr.name =
1484                                                 tz->trip_type_attrs[indx].name;
1485                 tz->trip_type_attrs[indx].attr.attr.mode = S_IRUGO;
1486                 tz->trip_type_attrs[indx].attr.show = trip_point_type_show;
1487
1488                 device_create_file(&tz->device,
1489                                    &tz->trip_type_attrs[indx].attr);
1490
1491                 /* create trip temp attribute */
1492                 snprintf(tz->trip_temp_attrs[indx].name, THERMAL_NAME_LENGTH,
1493                          "trip_point_%d_temp", indx);
1494
1495                 sysfs_attr_init(&tz->trip_temp_attrs[indx].attr.attr);
1496                 tz->trip_temp_attrs[indx].attr.attr.name =
1497                                                 tz->trip_temp_attrs[indx].name;
1498                 tz->trip_temp_attrs[indx].attr.attr.mode = S_IRUGO;
1499                 tz->trip_temp_attrs[indx].attr.show = trip_point_temp_show;
1500                 if (mask & (1 << indx)) {
1501                         tz->trip_temp_attrs[indx].attr.attr.mode |= S_IWUSR;
1502                         tz->trip_temp_attrs[indx].attr.store =
1503                                                         trip_point_temp_store;
1504                 }
1505
1506                 device_create_file(&tz->device,
1507                                    &tz->trip_temp_attrs[indx].attr);
1508
1509                 /* create Optional trip hyst attribute */
1510                 if (!tz->ops->get_trip_hyst)
1511                         continue;
1512                 snprintf(tz->trip_hyst_attrs[indx].name, THERMAL_NAME_LENGTH,
1513                          "trip_point_%d_hyst", indx);
1514
1515                 sysfs_attr_init(&tz->trip_hyst_attrs[indx].attr.attr);
1516                 tz->trip_hyst_attrs[indx].attr.attr.name =
1517                                         tz->trip_hyst_attrs[indx].name;
1518                 tz->trip_hyst_attrs[indx].attr.attr.mode = S_IRUGO;
1519                 tz->trip_hyst_attrs[indx].attr.show = trip_point_hyst_show;
1520                 if (tz->ops->set_trip_hyst) {
1521                         tz->trip_hyst_attrs[indx].attr.attr.mode |= S_IWUSR;
1522                         tz->trip_hyst_attrs[indx].attr.store =
1523                                         trip_point_hyst_store;
1524                 }
1525
1526                 device_create_file(&tz->device,
1527                                    &tz->trip_hyst_attrs[indx].attr);
1528         }
1529         return 0;
1530 }
1531
1532 static void remove_trip_attrs(struct thermal_zone_device *tz)
1533 {
1534         int indx;
1535
1536         for (indx = 0; indx < tz->trips; indx++) {
1537                 device_remove_file(&tz->device,
1538                                    &tz->trip_type_attrs[indx].attr);
1539                 device_remove_file(&tz->device,
1540                                    &tz->trip_temp_attrs[indx].attr);
1541                 if (tz->ops->get_trip_hyst)
1542                         device_remove_file(&tz->device,
1543                                   &tz->trip_hyst_attrs[indx].attr);
1544         }
1545         kfree(tz->trip_type_attrs);
1546         kfree(tz->trip_temp_attrs);
1547         kfree(tz->trip_hyst_attrs);
1548 }
1549
1550 /**
1551  * thermal_zone_device_register - register a new thermal zone device
1552  * @type:       the thermal zone device type
1553  * @trips:      the number of trip points the thermal zone support
1554  * @mask:       a bit string indicating the writeablility of trip points
1555  * @devdata:    private device data
1556  * @ops:        standard thermal zone device callbacks
1557  * @tzp:        thermal zone platform parameters
1558  * @passive_delay: number of milliseconds to wait between polls when
1559  *                 performing passive cooling
1560  * @polling_delay: number of milliseconds to wait between polls when checking
1561  *                 whether trip points have been crossed (0 for interrupt
1562  *                 driven systems)
1563  *
1564  * thermal_zone_device_unregister() must be called when the device is no
1565  * longer needed. The passive cooling depends on the .get_trend() return value.
1566  */
1567 struct thermal_zone_device *thermal_zone_device_register(const char *type,
1568         int trips, int mask, void *devdata,
1569         const struct thermal_zone_device_ops *ops,
1570         const struct thermal_zone_params *tzp,
1571         int passive_delay, int polling_delay)
1572 {
1573         struct thermal_zone_device *tz;
1574         enum thermal_trip_type trip_type;
1575         int result;
1576         int count;
1577         int passive = 0;
1578
1579         if (type && strlen(type) >= THERMAL_NAME_LENGTH)
1580                 return ERR_PTR(-EINVAL);
1581
1582         if (trips > THERMAL_MAX_TRIPS || trips < 0 || mask >> trips)
1583                 return ERR_PTR(-EINVAL);
1584
1585         if (!ops || !ops->get_temp)
1586                 return ERR_PTR(-EINVAL);
1587
1588         if (trips > 0 && !ops->get_trip_type)
1589                 return ERR_PTR(-EINVAL);
1590
1591         tz = kzalloc(sizeof(struct thermal_zone_device), GFP_KERNEL);
1592         if (!tz)
1593                 return ERR_PTR(-ENOMEM);
1594
1595         INIT_LIST_HEAD(&tz->thermal_instances);
1596         idr_init(&tz->idr);
1597         mutex_init(&tz->lock);
1598         result = get_idr(&thermal_tz_idr, &thermal_idr_lock, &tz->id);
1599         if (result) {
1600                 kfree(tz);
1601                 return ERR_PTR(result);
1602         }
1603
1604         strcpy(tz->type, type ? : "");
1605         tz->ops = ops;
1606         tz->tzp = tzp;
1607         tz->device.class = &thermal_class;
1608         tz->devdata = devdata;
1609         tz->trips = trips;
1610         tz->passive_delay = passive_delay;
1611         tz->polling_delay = polling_delay;
1612
1613         dev_set_name(&tz->device, "thermal_zone%d", tz->id);
1614         result = device_register(&tz->device);
1615         if (result) {
1616                 release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1617                 kfree(tz);
1618                 return ERR_PTR(result);
1619         }
1620
1621         /* sys I/F */
1622         if (type) {
1623                 result = device_create_file(&tz->device, &dev_attr_type);
1624                 if (result)
1625                         goto unregister;
1626         }
1627
1628         result = device_create_file(&tz->device, &dev_attr_temp);
1629         if (result)
1630                 goto unregister;
1631
1632         if (ops->get_mode) {
1633                 result = device_create_file(&tz->device, &dev_attr_mode);
1634                 if (result)
1635                         goto unregister;
1636         }
1637
1638         result = create_trip_attrs(tz, mask);
1639         if (result)
1640                 goto unregister;
1641
1642         for (count = 0; count < trips; count++) {
1643                 tz->ops->get_trip_type(tz, count, &trip_type);
1644                 if (trip_type == THERMAL_TRIP_PASSIVE)
1645                         passive = 1;
1646         }
1647
1648         if (!passive) {
1649                 result = device_create_file(&tz->device, &dev_attr_passive);
1650                 if (result)
1651                         goto unregister;
1652         }
1653
1654 #ifdef CONFIG_THERMAL_EMULATION
1655         result = device_create_file(&tz->device, &dev_attr_emul_temp);
1656         if (result)
1657                 goto unregister;
1658 #endif
1659         /* Create policy attribute */
1660         result = device_create_file(&tz->device, &dev_attr_policy);
1661         if (result)
1662                 goto unregister;
1663
1664         /* Update 'this' zone's governor information */
1665         mutex_lock(&thermal_governor_lock);
1666
1667         if (tz->tzp)
1668                 tz->governor = __find_governor(tz->tzp->governor_name);
1669         else
1670                 tz->governor = __find_governor(DEFAULT_THERMAL_GOVERNOR);
1671
1672         mutex_unlock(&thermal_governor_lock);
1673
1674         result = thermal_add_hwmon_sysfs(tz);
1675         if (result)
1676                 goto unregister;
1677
1678         mutex_lock(&thermal_list_lock);
1679         list_add_tail(&tz->node, &thermal_tz_list);
1680         mutex_unlock(&thermal_list_lock);
1681
1682         /* Bind cooling devices for this zone */
1683         bind_tz(tz);
1684
1685         INIT_DELAYED_WORK(&(tz->poll_queue), thermal_zone_device_check);
1686
1687         thermal_zone_device_update(tz);
1688
1689         if (!result)
1690                 return tz;
1691
1692 unregister:
1693         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1694         device_unregister(&tz->device);
1695         return ERR_PTR(result);
1696 }
1697 EXPORT_SYMBOL(thermal_zone_device_register);
1698
1699 /**
1700  * thermal_device_unregister - removes the registered thermal zone device
1701  * @tz: the thermal zone device to remove
1702  */
1703 void thermal_zone_device_unregister(struct thermal_zone_device *tz)
1704 {
1705         int i;
1706         const struct thermal_zone_params *tzp;
1707         struct thermal_cooling_device *cdev;
1708         struct thermal_zone_device *pos = NULL;
1709
1710         if (!tz)
1711                 return;
1712
1713         tzp = tz->tzp;
1714
1715         mutex_lock(&thermal_list_lock);
1716         list_for_each_entry(pos, &thermal_tz_list, node)
1717             if (pos == tz)
1718                 break;
1719         if (pos != tz) {
1720                 /* thermal zone device not found */
1721                 mutex_unlock(&thermal_list_lock);
1722                 return;
1723         }
1724         list_del(&tz->node);
1725
1726         /* Unbind all cdevs associated with 'this' thermal zone */
1727         list_for_each_entry(cdev, &thermal_cdev_list, node) {
1728                 if (tz->ops->unbind) {
1729                         tz->ops->unbind(tz, cdev);
1730                         continue;
1731                 }
1732
1733                 if (!tzp || !tzp->tbp)
1734                         break;
1735
1736                 for (i = 0; i < tzp->num_tbps; i++) {
1737                         if (tzp->tbp[i].cdev == cdev) {
1738                                 __unbind(tz, tzp->tbp[i].trip_mask, cdev);
1739                                 tzp->tbp[i].cdev = NULL;
1740                         }
1741                 }
1742         }
1743
1744         mutex_unlock(&thermal_list_lock);
1745
1746         thermal_zone_device_set_polling(tz, 0);
1747
1748         if (tz->type[0])
1749                 device_remove_file(&tz->device, &dev_attr_type);
1750         device_remove_file(&tz->device, &dev_attr_temp);
1751         if (tz->ops->get_mode)
1752                 device_remove_file(&tz->device, &dev_attr_mode);
1753         device_remove_file(&tz->device, &dev_attr_policy);
1754         remove_trip_attrs(tz);
1755         tz->governor = NULL;
1756
1757         thermal_remove_hwmon_sysfs(tz);
1758         release_idr(&thermal_tz_idr, &thermal_idr_lock, tz->id);
1759         idr_destroy(&tz->idr);
1760         mutex_destroy(&tz->lock);
1761         device_unregister(&tz->device);
1762         return;
1763 }
1764 EXPORT_SYMBOL(thermal_zone_device_unregister);
1765
1766 #ifdef CONFIG_NET
1767 static struct genl_family thermal_event_genl_family = {
1768         .id = GENL_ID_GENERATE,
1769         .name = THERMAL_GENL_FAMILY_NAME,
1770         .version = THERMAL_GENL_VERSION,
1771         .maxattr = THERMAL_GENL_ATTR_MAX,
1772 };
1773
1774 static struct genl_multicast_group thermal_event_mcgrp = {
1775         .name = THERMAL_GENL_MCAST_GROUP_NAME,
1776 };
1777
1778 int thermal_generate_netlink_event(struct thermal_zone_device *tz,
1779                                         enum events event)
1780 {
1781         struct sk_buff *skb;
1782         struct nlattr *attr;
1783         struct thermal_genl_event *thermal_event;
1784         void *msg_header;
1785         int size;
1786         int result;
1787         static unsigned int thermal_event_seqnum;
1788
1789         if (!tz)
1790                 return -EINVAL;
1791
1792         /* allocate memory */
1793         size = nla_total_size(sizeof(struct thermal_genl_event)) +
1794                nla_total_size(0);
1795
1796         skb = genlmsg_new(size, GFP_ATOMIC);
1797         if (!skb)
1798                 return -ENOMEM;
1799
1800         /* add the genetlink message header */
1801         msg_header = genlmsg_put(skb, 0, thermal_event_seqnum++,
1802                                  &thermal_event_genl_family, 0,
1803                                  THERMAL_GENL_CMD_EVENT);
1804         if (!msg_header) {
1805                 nlmsg_free(skb);
1806                 return -ENOMEM;
1807         }
1808
1809         /* fill the data */
1810         attr = nla_reserve(skb, THERMAL_GENL_ATTR_EVENT,
1811                            sizeof(struct thermal_genl_event));
1812
1813         if (!attr) {
1814                 nlmsg_free(skb);
1815                 return -EINVAL;
1816         }
1817
1818         thermal_event = nla_data(attr);
1819         if (!thermal_event) {
1820                 nlmsg_free(skb);
1821                 return -EINVAL;
1822         }
1823
1824         memset(thermal_event, 0, sizeof(struct thermal_genl_event));
1825
1826         thermal_event->orig = tz->id;
1827         thermal_event->event = event;
1828
1829         /* send multicast genetlink message */
1830         result = genlmsg_end(skb, msg_header);
1831         if (result < 0) {
1832                 nlmsg_free(skb);
1833                 return result;
1834         }
1835
1836         result = genlmsg_multicast(skb, 0, thermal_event_mcgrp.id, GFP_ATOMIC);
1837         if (result)
1838                 dev_err(&tz->device, "Failed to send netlink event:%d", result);
1839
1840         return result;
1841 }
1842 EXPORT_SYMBOL(thermal_generate_netlink_event);
1843
1844 static int genetlink_init(void)
1845 {
1846         int result;
1847
1848         result = genl_register_family(&thermal_event_genl_family);
1849         if (result)
1850                 return result;
1851
1852         result = genl_register_mc_group(&thermal_event_genl_family,
1853                                         &thermal_event_mcgrp);
1854         if (result)
1855                 genl_unregister_family(&thermal_event_genl_family);
1856         return result;
1857 }
1858
1859 static void genetlink_exit(void)
1860 {
1861         genl_unregister_family(&thermal_event_genl_family);
1862 }
1863 #else /* !CONFIG_NET */
1864 static inline int genetlink_init(void) { return 0; }
1865 static inline void genetlink_exit(void) {}
1866 #endif /* !CONFIG_NET */
1867
1868 static int __init thermal_init(void)
1869 {
1870         int result = 0;
1871
1872         result = class_register(&thermal_class);
1873         if (result) {
1874                 idr_destroy(&thermal_tz_idr);
1875                 idr_destroy(&thermal_cdev_idr);
1876                 mutex_destroy(&thermal_idr_lock);
1877                 mutex_destroy(&thermal_list_lock);
1878                 return result;
1879         }
1880         result = genetlink_init();
1881         return result;
1882 }
1883
1884 static void __exit thermal_exit(void)
1885 {
1886         class_unregister(&thermal_class);
1887         idr_destroy(&thermal_tz_idr);
1888         idr_destroy(&thermal_cdev_idr);
1889         mutex_destroy(&thermal_idr_lock);
1890         mutex_destroy(&thermal_list_lock);
1891         genetlink_exit();
1892 }
1893
1894 fs_initcall(thermal_init);
1895 module_exit(thermal_exit);